2021 Honda Civic - OBD II not connecting. All keys are lost.

Summary

This is a troubleshooting video, not a product review. The presenter works on a 2021 Honda Civic with an all-keys-lost situation and no communication through the OBD-II port.

Key Findings and Steps

• The car had battery power, but the unprogrammed key would not start it.
• The presenter checked fuse No. 7 and the other fuses in the cabin fuse box; they appeared intact. He also checked the fuses near the battery.
• One fuse near the battery looked damaged. He replaced it with a matching fuse and proceeded to program a key using a diagnostic tool, following its prompts.
• Key programming appeared successful: the immobilizer warning light went out, and the remote lock/unlock function was tested.
• The engine then made a severe metallic knocking sound and did not seem safe to run. The presenter suspected an engine problem and left it for a mechanic to assess.
• He also noticed a loose-looking battery connection with bent terminals and speculated that an earlier jump-start might have caused electrical damage. This was not confirmed.
• After further handling and testing, the remote and key indicator behavior changed. Applying a jump or booster appeared to restore the key chime and normal indicator behavior, but the presenter did not establish a definite cause.
• He planned to inform the bank, which owned the repossessed vehicle, about the issues.

Pros, Drawbacks, and Verdict

• Useful diagnostic takeaway: Inspect fuses carefully, including those near the battery; a visual check of the cabin fuse panel alone may miss a problem.
• Limitation: The electrical fault was not conclusively diagnosed, and the engine’s metallic noise remained unresolved.
• Overall: The video shows that key programming may be possible once communication is restored, but it does not provide a confirmed, complete repair. A mechanic should assess the Civic before further starting attempts.

Speakers

• Presenter: Led the fuse checks and key-programming process. He noted that he was not a mechanic and was uncertain about the electrical fault.
• Helper/trainee: Operated the diagnostic tool under the presenter’s direction. No separate product assessment or comparison was given.